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Class Information
Number: 340/511
Name: Communications: electrical > Condition responsive indicating system > With particular system function (e.g., temperature compensation, calibration) > Alarm system supervision > Threshold or window (e.g., of analog electrical level)
Description: Subject matter wherein the supervisory circuit is coupled to the primary alarm circuit and is responsive to the signal therein attaining a predetermined level or range of levels.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4866425 |
Detector for sensing and/or measuring passing objects |
Sep. 12, 1989 |
| 4862142 |
Circuit with memory for detecting intermittent changes in resistance, current, voltage, continuity, power interruption, light, and temperature |
Aug. 29, 1989 |
| 4833451 |
Individual source identification |
May. 23, 1989 |
| 4831361 |
Environmental abnormality alarm apparatus |
May. 16, 1989 |
| 4825195 |
Method of monitoring to anticipate the triggering of an alarm |
Apr. 25, 1989 |
| 4818994 |
Transmitter with internal serial bus |
Apr. 4, 1989 |
| 4804942 |
Verifying automatic line integrity diagnostic (V.A.L.I.D.) apparatus and methods for intrusion detection systems |
Feb. 14, 1989 |
| 4803469 |
Fire alarm system |
Feb. 7, 1989 |
| 4785284 |
Fire monitoring system |
Nov. 15, 1988 |
| 4785283 |
Detecting system and detector |
Nov. 15, 1988 |
| 4785285 |
Parallel bus alarm system |
Nov. 15, 1988 |
| 4783659 |
Analog transducer circuit with digital control |
Nov. 8, 1988 |
| 4777473 |
Alarm system incorporating dynamic range testing |
Oct. 11, 1988 |
| 4763286 |
Measured data pass-fail discriminating apparatus |
Aug. 9, 1988 |
| 4758823 |
System for protecting a group of locations of a network by anticipating vandalism |
Jul. 19, 1988 |
| 4752698 |
Emergency supervisory system |
Jun. 21, 1988 |
| 4751498 |
Single-wire loop alarm system |
Jun. 14, 1988 |
| 4749987 |
Analog fire detector and analog fire alarm system using the same |
Jun. 7, 1988 |
| 4749986 |
Collecting process of fire data and fire detector using the process and fire alarm system also using the process |
Jun. 7, 1988 |
| 4745399 |
Device for generating an alarm signal in the event of an environmental abnormality |
May. 17, 1988 |
| 4742334 |
Single-wire loop alarm system |
May. 3, 1988 |
| 4727359 |
Analog fire sensor |
Feb. 23, 1988 |
| 4725820 |
Composite detector |
Feb. 16, 1988 |
| 4725819 |
Fire detection system |
Feb. 16, 1988 |
| 4720806 |
Method and apparaus for centrally collecting measured values |
Jan. 19, 1988 |
| 4717907 |
Remote parameter monitoring system with location-specific indicators |
Jan. 5, 1988 |
| 4692750 |
Fire alarm system |
Sep. 8, 1987 |
| 4688021 |
Combined smoke and gas detection apparatus |
Aug. 18, 1987 |
| 4668939 |
Apparatus for monitoring disturbances in environmental conditions |
May. 26, 1987 |
| 4665384 |
Signal-transmitting junction unit of hazard alarm system |
May. 12, 1987 |
| 4651138 |
Intruder alarm system |
Mar. 17, 1987 |
| 4646065 |
Fault-tolerant control system |
Feb. 24, 1987 |
| 4644331 |
Fire alarm system |
Feb. 17, 1987 |
| 4638304 |
Environmental abnormality detecting apparatus |
Jan. 20, 1987 |
| 4626831 |
Analog signal processing circuit |
Dec. 2, 1986 |
| 4622538 |
Remote monitoring system state machine and method |
Nov. 11, 1986 |
| 4622539 |
Alarm system with alarm message supervision |
Nov. 11, 1986 |
| 4618853 |
Fire detector |
Oct. 21, 1986 |
| 4612534 |
Method of transmitting measuring values in a monitoring system |
Sep. 16, 1986 |
| 4607252 |
Monitoring system for production lines |
Aug. 19, 1986 |
| 4597451 |
Fire and explosion detection and suppression |
Jul. 1, 1986 |
| 4598271 |
Circuit arrangement for monitoring noise levels of detectors arranged in an alarm installation |
Jul. 1, 1986 |
| 4588987 |
Display system for monitoring and alarm system |
May. 13, 1986 |
| 4586028 |
Alarm system |
Apr. 29, 1986 |
| 4575711 |
Alarm terminal device |
Mar. 11, 1986 |
| 4573040 |
Fail-safe instrument system |
Feb. 25, 1986 |
| 4567471 |
Monitoring system |
Jan. 28, 1986 |
| 4562548 |
Alarm limit recentering arrangement for maintaining uniform alarm limit tolerances about a sloping regulation characteristic |
Dec. 31, 1985 |
| 4556873 |
Fire alarm system |
Dec. 3, 1985 |
| 4555698 |
Detecting machine tool set-up errors |
Nov. 26, 1985 |
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